The authentic GeekVape Zeus Dual RTA is an upgraded dual coil version of the original Zeus RTA, with the innovative leak-proof top airflow system, airflow transferring from the top to the bottom to maintain great flavor. It comes with upgraded postless build deck that allows for easy building with both single coil and dual coil. Zeus Dual RTA is compatible with 810 and 510 drip tip and 5.5ml bubble tank (not included).This RTA is Standard Edition with 4ml of capacity.